If you've got lots of addons in Pale Moon, I'd make the suggestion of starting it in Safe Mode with addons disabled, (hold down SHIFT while starting). Then just re-enable DownloadHelper and see if it's OK.

---Always "download", never "and convert"; I am not a paying customer there.

---However, 4wd, if you don't have any problems downloading from YouTube, (thank you for informing!), my problem must be one of the addons. It so far seems I must take the hard walk, testing them. There really are times when I want fewer extensions... (?!)

Yes, I have been experiencing this issue. Always seems to occur if attempting to download a Vevo video. Also occurs at other times, as well. I just assumed that Youtube did something recently to prevent people from saving the videos and they haven't finished fully rolling it out, yet. I never thought it could be an issue with DownloadHelper, itself. Hmmm...

^interesting. Just before you posted, I was thinking, "are they all originally from Vevo?" and then you said the same thing! Maybe Vevo is the sinner? I will remember to make a note about this the next time I go video hunting.

I've managed to solve part of the problem, but not the problem itself. Go to http://www.youtube.com/html5 and click "Use HTML5 Player when possible", and YouTube will then offer one more file for downloading. This one DownloadHelper will grap, even if it originates from Vevo.

Thanks for the clarification. However, there was no "enable all", to finish the job!

I have not visited VEVO for sooo looong that I completely had forgotten that VEVO is synonymous with "Sorry! The page you are looking for is not available in your region." I have tried HOLA Unblocker /USA, but it didn't pay out at once, so I skipped it again.

You don't have to actually visit VEVO to end up with a VEVO video that you can not download. Those videos are all over the place on Youtube and I run into them quite often when performing searches for music.

For example, that Youtube video link in your original post is a VEVO video.

And the longer the video plays while I keep that menu open, the more it grows.

Also, when visiting another page on Youtube, the list from the previous video doesn't clear, and you don't get any links for the video on the current page. You have to refresh the page to get those, and the links from the previous page are still there, too.

It adds a little dropdown button under the Subscribe button on a Youtube page, right next to the thumbs up/down. It also offers an option for MP3 download. It's not as nice as DH, in that it won't properly name the files for you. They default to "videoplayback". The MP3's are named ok, but this is done through a 3rd party service, which opens in a new tab with the link to download the MP3 file.

But it does work with the videos that DH fails on, so as a backup method, I'll keep it around, for now.